Natyyo Gray, a former Jackson police officer, is accused in the Nov. 20, 2011, death of his 1-year-old daughter, Aubrey Zoe Brown, who died of an internal hemorrhage after suffering blunt-force trauma to the abdomen while in Gray's care, prosecutors said.

Gray testified that he never disciplined the child, because he didn't have to -- she was a good baby.

He broke down on the witness stand as he explained what happened in the moments leading up the to child's death. Gray said she had not been acting normally on the morning she died.

Gray said his daughter was lactose intolerant and became constipated after drinking milk. He testified that on the day she died, the child was sitting on the couch and began to struggle and look uncomfortable, as if she were constipated and he massaged her stomach, as he had done before.

"It was a bad one. She acted like she was hurting," Gray said. "I massaged her stomach. She was inhaling, but not exhaling. I started CPR while calling 911."

Gray said he had never done CPR on a child before.

A doctor from the University of Mississippi Medical Center testified Tuesday that the baby's death was the result of child abuse.

Dr. Scott Benton said the infant only had minutes to live after she was injured.

"When we look at similar events that have forces compatible or consistent with these, these are mostly motor vehicle crashes that cause the abdominal type injuries," Benton said.

Last week, the baby's mother and Gray's former girlfriend, Phyllis Brown, testified that initially Gray wanted to have nothing to do with the girl. Phyllis Brown also testified that she did not see any bruises on her daughter's body before she left the child with Gray.

Phyllis Brown said she had two insurance policies on the child.

Dr. Erin Barnhart testified that the toddler not only had multiple bruises on her stomach and head, but that her internal injuries were so bad, some organs were torn or ripped in half.

Defense attorneys plan to call former state pathologist Dr. Steven Hayne to the stand. Attorneys said he will show that the child was injured before she was left in Gray's care.

Gray denies claims he wanted nothing to do with his child. He testified that he loved Aubrey and that her mother used the child as a bargaining tool.

Court officials said the case could go to the jury before the end of the week.